update readme [ci skip]

Author: le0pard

README.md

@@ -58,7 +58,12 @@ For rails 3.0.x latest version 0.2.8.
           host: localhost
           port: 27017
           replica_set: true
-       
+          
+   Also you can use "url" parameter for setup connection to mongodb:
+
+        development:
+          url: mongodb://localhost:27017/my_app
+          capsize: <%= 10.megabytes %>
 
 
 1. For using with MongoDB Replica Set (more info you can read by this link [http://www.mongodb.org/display/DOCS/Replica+Sets](http://www.mongodb.org/display/DOCS/Replica+Sets)). In config set list of [host, port] in key "hosts":